Direktori jurnal elektronik Politeknik Negeri Padang (PNP)
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Modifikasi Pisau pada Mesin Pencacah Tongkol Jagung untuk Produksi Pakan Ternak
Full text linkTongkol jagung merupakan limbah pertanian yang berpotensi sebagai bahan baku pakan ternak, selain itu dapat juga dimanfaatkan untuk pembuatan pupuk organik, bioetanol, syngas, dan briket. Limbah tongkol jagung jika diolah dengan cara dicacah dapat dijadikan sebagai bahan baku alternatif pakan ternak, sehingga dapat memberikan nilai tambah bagi petani. Untuk itu dibuatlah mesin pencacah yang dapat menghancurkan tongkol jagung menjadi granul atau serpihan. Berdasarkan perencanaan perhitungan, maka spesifikasi mesin pencacah tongkol jagung adalah sebagai berikut: Mesin menggunakan dinamo listrik berdaya 1 HP, poros yang digunakan terbuat dari material ST 37 dengan diameter 25 mm, untuk menyalurkan daya dari dinamo ke poros digunakan kopling FCL 90, dan bilah pencacah terbuat dari plat ST 37 dengan ketebalan 3 mm. Mesin ini memiliki kapasitas produksi sebesar 21 kilogram/jam
Rancang Bangun Alat Pembelah Kelapa Muda Dengan Mekanisme Pengungkit
Full text linkKelapa muda merupakan komoditas yang banyak diminati karena memiliki kandungan udara dan daging buah yang menyegarkan. Namun, metode pembelahan kelapa yang masih tradisional memiliki beberapa kelemahan, seperti rendahnya efisiensi waktu, risiko cedera yang tinggi, dan memerlukan keterampilan khusus. Penelitian ini bertujuan untuk merancang dan membangun alat pembelah kelapa muda menggunakan mekanisme pengungkit yang lebih aman, efisien, dan mudah dioperasikan. Metode perancangan meliputi studi literatur, pengumpulan data melalui observasi, dan proses fabrikasi dengan berbagai tahapan, termasuk pemotongan, pengelasan, perakitan, serta uji kinerja. Mekanisme pengungkit tipe kedua dipilih sebagai prinsip dasar kerja alat ini, di mana titik beban berada di antara titik tumpu dan titik kekuasaan. Hasil pengujian menunjukkan bahwa alat ini mampu membelah kelapa muda dengan waktu rata-rata 8,4 detik, lebih cepat dibandingkan metode manual yang memerlukan waktu sekitar 25 detik. Selain itu, alat ini terbukti aman dengan mengurangi risiko cedera bagi pengguna. Alat ini memiliki beberapa kelebihan, seperti efisiensi waktu, biaya produksi yang terjangkau, dan kemudahan dalam pengoperasian. Namun terdapat kekurangan pada desain pegangan yang masih membutuhkan tenaga lebih besar bagi pemula. Dengan demikian, alat pembelah kelapa muda ini dapat menjadi solusi praktis bagi pedagang kecil dan menengah untuk meningkatkan produktivitas dan keselamatan kerja
Perancangan Mesin Pengering Daun Serai Sistem Rotary
Full text linkSerai merupakan salah satu jenis rumput-rumputan yang sudah sejak lama di budidayakan di Indonesia. Untuk menaikan pendapatan petani serai perlu dilakukan usaha perluasan kegiatan sehingga ada added value bagi petani. Untuk itu perlu dilakukan pembuatan sebuah alat yang digunakan untuk mengolah serai menjadi minyak serai. Tujuan dari rancang bangun ini untuk merancang dan mendesain mesin pengering daun Serai sistem rotary, untuk membuat gambar kerja mesin pengering daun Serai sistem rotary
Perancangan Alat Pengolah Limbah Plastik Jenis PET (Polyethylene Terephthalate) Kapasitas 3 kilogram dengan Menggunakan Kompor Oli Bekas
Full text linkPlastic is one of the materials widely used in society, one of which is PET (Polyethylene Terephthalate) plastic. Plastic is basically formed from petroleum, so it can be returned to its original form by the pyrolysis process. The pyrolysis process converts organic material at high temperatures and breaking down into smaller molecular bonds. Research and design of pyrolysis have been extensively studied before, with variations in the types of plastic waste burned or the type of fuel used to achieve the optimal heating rate. The fuel used in previous studies included fuels such as charcoal, LPG gas, and bicket from certain waste. In this study, the combustion process uses a jet stove with used oil fuel so that automotive waste can be used as fuel. The design method used in the manufacture of this plastic waste processing tool is the Pahl & Beitz design method, which begins with identifying problems, developing and planning concepts until the required concept is selected. In this design, the results of the 3 kg capacity pyrolysis design were obtained with the main components, namely a reactor tube with specifications of ∅250 mm and a height of 320 mm, a smoke conductor pipe using a galvanized pipe type with ∅25.4 mm, a copper spiral condenser pipe with ∅1/4 in, a condenser tube with specifications of ∅230 mm and a height of 250 mm, a tool frame using 30 mm × 30 mm × 3 mm angle iron made of carbon steel. In testing using Computational Fluid Dynamics simulation in the Solidwork application, a smoke temperature of 400 ℃ was obtained
Rancang Bangun Mesin Pengiris Tempe Otomatis Berbasis Mikrokontroler Arduino Uno
Full text linkProses pengirisan tempe secara manual sering kali memerlukan waktu dan tenaga yang signifikan, serta menghasilkan irisan dengan ketebalan yang tidak konsisten. Untuk mengatasi masalah ini, dirancang sebuah mesin pengiris tempe otomatis berbasis mikrokontroler Arduino Uno yang bertujuan untuk meningkatkan efisiensi dan konsistensi dalam pengolahan tempe. Mesin ini dirancang untuk mengotomatisasi proses pengirisan tempe, mengurangi pekerjaan manual. Rancang bangun mesin mencakup perancangan mekanis dan elektronik, dengan spesifikasi mesin sebagai berikut: panjang 607 mm, lebar 504 mm, tinggi 420 mm, daya motor 0,47 hp, dan putaran motor 1400 rpm. Mesin ini menggunakan pisau pengiris berputar dan wadah tempe yang bergerak secara otomatis ke kiri dan kanan. Sistem pendorong yang dikendalikan oleh motor stepper dan Arduino Uno. Mesin ini dapat mengiris tempe dengan ketebalan 3,7 – 5,3 mm.
Kata kunci: tempe, otomatis, mesin, arduino, un
The impact of Task-Based Language Teaching (TBLT) on EFL learner’s Engagement in Speaking Courses
Full text linkThis study investigates the impact of Task-Based Language Teaching (TBLT) on learner engagement in English as a Foreign Language (EFL) speaking courses. The research focused on how TBLT influences students’ active participation, motivation, and oral language development. A quasi-experimental research design was employed, involving 63 second-semester students from the English for Professional Communication course. The experimental group received instruction using task-based methods, while the control group followed conventional teaching approaches. Data were gathered through pre- and post-speaking performance tests, semi-structured interviews with instructors, and student perception questionnaires. Quantitative findings indicated no statistically significant differences between the two groups; however, qualitative data revealed notable improvements in fluency, reduced usage of fillers, and increased speaking confidence among students exposed to TBLT. Instructors also reported higher levels of student engagement and interaction during TBLT sessions. The study concludes that TBLT holds considerable promise for enhancing learner engagement and speaking competence in EFL settings, particularly in vocational education contexts
SOSIALISASI PEMILU BAGI PEMILIH PEMULA
Full text linkNew voters play an important role in the election because as many as 35-40% of all voters are new voters. In this way, the number of first-time voters is very large, so that citizens' rights to exercise their right to vote should not be insignificant as a result of unexpected mistakes, for example, do not let them already have the right to vote and not be able to exercise their right to vote because they are not registered or there are still many errors in exercise their right to vote, etc.Dian Andalas Private High School is located in Komp. Unand Ulu Gadut. There are 70 students from Dian Andalas Private High School who are in the category of beginner voters in the 2024 elections. There are still many students who do not understand the importance of voting rights in general elections and do not know the procedures for granting voting rights at polling stations.The aim to be achieved from this service activity is to provide insight and improve skills for Dian Andalas Private High School students in their participation in the upcoming 2024 elections.The output target that will be achieved is the students of the Dian Andalas Private High School, by carrying out this activity, it is hoped that the students of the Dian Andalas Private High School, Padang, will participate in the general election and know the procedures for voting in the general election.
 
Analisis Geometrik Jalan Raya dengan Pendekatan Bina Marga (Studi Kasus : Jl. Poros Tikungan SP 4, Kelurahan Makbalim, Kilometer 37, Kabupaten Sorong)
Full text linkThe purpose of road geometry planning is to produce safe infrastructure and the maximum efficiency of traffic flow services. It can maximize the ratio of the level of use of the implementation cost on the road. The condition of Jalan Poros, Bend SP 4, Sorong Regency is a straight road and there are several steep and sharp bends, so it becomes one of the factors for accidents. Slippery road conditions are also often a factor in accidents for two-wheeled users. The purpose of this study is to analyze and describe the condition of the road geometry and also to evaluate the horizontal curve (bend) on the SP 4 bend axis road section and whether it is appropriate based on the 2020 Bina Marga Guidelines. The research method used is quantitative research. The primary data used in this study are road geometric data, environmental conditions, topographic maps, road width, and curve length. The secondary data are plan speed data, bend coordinate data, and plan drawings. The value of e in calculating the distribution curve coefficient f and e gives a value of 8.75%, while the value of Lc (calculating the length of the transition curve) = 207.07 m. The requirement for the spiral-circle-spiral curve is Lc ≥ 20m so this curve can be designed as a spiral-circle-spiral curve. The SP 4 bend in Sorong Regency has a flat terrain type. Based on calculations, the value of Lc = 206.893 and the value of Ls = 29.76. Both values are more than 20m, so they meet the requirements of a type bend.  
Analisis Distribusi Termal Model Tabung Rheology Test Apparatus Sebagai Media Pengujian Ultrafine Bubbles (UFBs)
Full text linkThe Fukushima Daiichi nuclear reactor accident has become a major concern in the development of safety design for advanced nuclear reactors. The reactor coolant system is part of the passive safety system, including the containment or reactor building cooling system. This system is designed to prevent damage to the reactor vessel structure and concrete building materials due to excessive heat release into the environment. The coolant flow is designed to move naturally without the help of a pump, utilizing the difference in fluid density as the main driver. The type of coolant plays a major role in generating the flow, especially in terms of its density properties. Fluids with a lower density than water can produce faster flow. One method to reduce the density of water is to insert fine bubbles known as ultrafine bubbles (UFB). To study the thermal characteristics of the fluid when heated, the Rheology Test Apparatus device is used. This study specifically examines the Rheology tube model. Analysis of temperature distribution in the tube is carried out using Computational Fluid Dynamics (CFD) simulations to understand the heat transfer mechanism. The validation process was carried out through experiments at a fluid temperature of 90°C, with a comparison of the temperatures at two points in the height of the tube, namely 0.16m and 0.8m, which are the locations of the heater and show the highest temperature
Pemasangan Pembangkit Listrik Tenaga Surya (PLTS) untuk Mushalla Al Barkah di Kelurahan Limau Manis, Kecamatan Pauh, Kota Padang
No full textThe Al Barkah prayer room is located in Limau Manis Village, Pauh District, Padang City and still frequently experiences power outages. This condition often causes disturbances to residents when carrying out their worship, so an alternative source of electricity is needed, namely a Solar Power Plant (SPP). The electrical load in this prayer room consists of 8 lamp units. The optimal time for SPP energy convertion is morning until midday, around 08.00 to 12.00. The effect of temperature on the efficiency of the SPP system can be seen from the decrease in power produced even though the intensity of sunlight is still high. This analysis provides a general overview of the performance of SPP without load in one day, showing the importance of monitoring temperature and sunlight intensity to optimize electrical energy output. At noon, around 12:00 to 13:00, the SPP system reaches peak energy conversion. The voltage and current reached their highest values, with power reaching 146.2 W at 12:00 and decreasing slightly to 119.7 W at 13:00 even though the sun's intensity reached its highest peak, namely 1115 W/m². In the afternoon, from 14:00 to 17:00, it shows a significant drop in voltage, current and power. At 14:00, the power produced is still quite high, namely 142.1 W, with a solar intensity of 1009 W/m². However, after 15:00, the power generated decreases drastically, only reaching 36.3 W at 15:00 and decreasing further to 23.5 W at 17:00, with a solar intensity of only 100 W/m²